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Geologic Time 9 Name Date Class  LESSON 1 Geologic History and the Evolution of Life Directions: On the line before each definition, write the letter of the term that matches it correctly. Each term is used only once. 1. a subdivision of periods on the geologic time scale 2. the time line of Earths past 3. is nearly 90 percent of Earths history 4. the largest unit of geologic time 5. Mass extinctions are caused by sudden changes in this. 6. the disappearance of many species within a short time period 7. Organisms are dependent on this for survival. 8. provides evidence of meteorite impact 9. blocks sunlight resulting in environmental changes 10. the change in species over time as organisms adapt to their environments 11. connects two continents that were once separated 12. separation of species due to a physical barrier 13. the earliest life-forms 14. the sudden evolution of new, complex life-forms A. Cambrian explosion B. environment C. eon D. epoch E. evolution F. fossil record G. geographic isolation H. geologic time scale I. iridium J. land bridge K. mass extinction L. Precambrian time M. single-celled organisms N. volcanic activity Geologic Time 13 Name Date Class   LESSON 1 Geologic History and the Evolution of Life Key Concept How is evolution affected by environmental change?  Directions: On the line before each statement, write T if the statement is true or F if the statement is false. 1. The earliest of all fossil evidence is in rocks that are about 1.5 billion years old. 2. The earliest life-forms were single-celled. 3. Some Precambrian life-forms were multicellular. 4. Scientists discovered that multicelluar organisms existed about 2 bya. 5. Scientists hypothesize that large, Precambrian, soft-bodied multicellular organisms still exist. 6. The Cambrian explosion occurred about 700 mya. 7. The Cambrian explosion is significant because this is when the first soft-tissued organisms evolved. 8. Organisms from the Cambrian period left behind more fossil record evidence than organisms from Precambrian time. 9. Organisms from the Cambrian period had anatomy that was much different from present-day animals. 10. Scientists hypothesize that some Cambrian period organisms are distant ancestors of present-day organisms. 11. Fossil records from the Archean eon show that single-celled organisms existed at this time. Geologic Time 19 Name Date Class   LESSON 1 The Biggest Event in the History of Earth When Earth was a scant 50 million years old, an infant planet still forming and still largely molten, it collided with an object about the size that Mars is today. Fragments of the object and much of Earths crust were flung into space. Quickly, this material assumed an orbit around Earth. Eventually, this material coalesced, or combined, to become our Moon. This is the best accepted theory of how the Moon formed, but there are several others. The Fission Theory The fission theory proposes that Earth was once spinning very rapidlyfast enough to throw some of its crust into orbit, which then coalesced into the Moon. However, lunar soil has been exposed to more intense heat, or baking, than Earth soil. Lunar soil is not as hydrated as Earth soil, meaning there are fewer molecules of water inside lunar rock. If the Moon were made entirely from Earths crust, the rocks would not be different in this way. The Capture Theory The capture theory proposes that the Moon formed somewhere else and was simply captured by Earths gravity as it drifted by. Scientists are reluctant to believe that the Moon just drifted by at the right time, at the right angle, and at the right speed for Earths gravitational field to capture it. This theory also does not explain why Moon rocks have experienced more baking than Earth rocks. The Condensation Theory The condensation theory proposes that the Moon and Earth coalesced at the same time from the material in the solar nebula that formed the solar system. If this were true, the Moon would have the same composition as Earth. But it doesnt. This theory also fails to explain the Moon rocks extra baking. The Giant Impactor Theory An impactor about the size of Mars struck Earth at an oblique angle. This glancing blow, rather than a direct hit, vaporized the impactor and removed some of Earths molten mantle. The cataclysmic collision created such heat that the ejected material flew into space like molten fireworks. This extreme heat explains the extra baking of Moon rocks. The glancing blow also gave Earth its 24-hour days. The Moon now orbits Earth in the same direction as Earths rotation. This impactor material and Earths mantle were put in orbit around Earth, and this material eventually formed the Moon. The giant impactor theory is the best fit with what is known today. Applying Critical-Thinking Skills Directions: Respond to each statement. 1. Develop an idea about how Earths history might have been different if the Moon had not been present. 2. Describe what might have happened to early Earth if, instead of an oblique hit, it had been delivered a direct hit from a Mars-sized object while Earth was still mostly molten. 20 Geologic Time Name Date Class   LESSON 1 Time-Travel Trips Ninety percent of Earths history had already happened before the beginning of the Paleozoic era. That early time is the Precambrian era, from the formation of Earth 4.6 bya to 542 mya. This era is divided into three eonsthe Hadean, the Archean, and the Proterozoic. Each of these eons experienced distinguishing events, especially the Archean and the Proterozoic. Plan a Travel Brochure Suppose you are a travel agent who specializes in time travel. One of the trips is a tour of Precambrian time, and visitors get to briefly visit and observe Earth during each of the Precambrian eons. Your tour promises visitors that they will see at least one thing that distinguishes each eon. Design and illustrate a folding, three-page brochure that promotes your time tour of the Precambrian. Write a brief statement that describes what the visitors will see on the tour, and illustrate each eon in color. Include your notes on the panels below.  Content Vocabulary Content Practice A Key Concept Builder Environmental conditions in Precambrian time supported the evolution of the first life-forms on Earth. Precambrian life then led to the evolution of new, more complex life-forms in the Cambrian period. 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